Tube-cutting tool.



J. STERNAD.

' TUBE CUTTING TOOL.

APPLICATION IILED AUG. 21, 1912. I 1 69 96 Patented Aug. 12, 1913.

2 SHEETS-SHEET l.

COLUMBIA PLANOGRAPH c0, WASHINGTON. D. c.

J. STERNAD.

TUBE CUTTING TOOL.

APPLICATION FILED AUG 21, 1012.

1,069,986, Patented Aug. 12, 1913.

2 SHEETSSHBET 2.

COLUMBIA PLANOGRAPH CO.,WASHINGTDN,D1C.

UNTTE STA JOHN STERNAD, OF JERS FFTQF.

EY CITY, NEW JERSEY.

TUBE-CUTTING- TOOL.

To all whom it may concern Be it known that 1, JOHN STERNAD, a citizen of the United States, and a resident of Jersey City, county of Hudson, and State of New Jersey, have invented certain new and useful Improvements in Tube Cutting Tools, of which the following is a full, clear, and exact specification, reference being had to the accompanying drawings, wherein- Figure 1 is an elevation, partly sectional, view of a tube cutter, constructed according to my invention. Fig. 2 is a front, partly sectional, view on line 2-2 indicated in Fig. 1 looking to the left; Fig. 3 is a sectional view and partly elevation on line 3-3 indicated in Fig. 1 looking to the right. Fig. 1 is a. sectional view on line H indicated in Fig. 1 looking to the left; and Fig. 5 is an end view of the other end of the tool; Fig. 6 is a detail view, an elevation, and Fig. 7 an end view of the cutter bar and of the cutter mounted thereon. Fig. 8 is an ele vation, partly sectional, view, showing a modified construction of the tool; Fig. 9 is a sectional view, partly elevation, on line 9--9 indicated in Fig. 8, looking to the right. Fig. 10 is a detail View, an elevation of the support for the cutters; and Fig. 11 a front view of the tool shown in Fig. 8, part of the front plate being removed to show the means of turning the cutter shaft and the feed screw.

My improved tube cutter comprises, essentially, a shaft, a support of the cutters mounted thereon, means for expanding the cutters and means for rotating the tool. In the construction shown in Figs. 1 to 7 the tool is composed of the hollow shaft 6, the collar 7, set thereon to rotate with the shaft, the cutter supports 8, pivoted thereto; the cutters 9, one fixed on each of the supports 8; the head 10, slidably mounted on shaft 6 and splined thereto; the feed screw 11, extending through the shaft 6 and provided with hand wheel 12 for turning it, and of the ratchetwheel 12, which may be secured to an extension of the collar 7, or made integral therewith, and the pawl 13, pivoted to handle 15, whereby the tool is rotated.

The shaft 6 is provided with key-ways 1 1- and 15, one on each end; the key 15 of the head 10 engages in the key-way 14, and the key 15, of the collar 7. in the key-way 15, whereby these two parts are held to rotate with the shaft. The cutter supports 8 are formed in the shape of bars, recessed on Specification of Letters Patent.

Patented Aug. 12,1913.

1912. Serial No. 716,242.

one end, 8 by which they are pivoted in the lugs 16, provided on collar 7, and their other ends, 8", are loosely fitted into the grooves- 17, provided in the head 10. The cutters 9 are fixed on their supports, the cutter bars 8, and are held thereon by cross pins 19, as shown in Figs. 6 and 7. They are propelled by the rotating of the tool, in the tube, and act upon the tube, cutting it, being pressed against it by the expanding of the cutter bars. To this end the bottoms of grooves 17 (see Figs. 1 and 4) are made ascending from the forward face of head 10, and the ends 8 of the cutter bars 8 are shaped like runners, as shown in detail Fig. 6, to slide thereon, so that when the head 10 is drawn in, toward the collar 7, the cutter bars are expanded, that is, spread apart and away from the shaft, and the orbit of the cutters 9 is correspondingly extended. For this purpose the screw 11 is provided. This screw is quite snugly fitted in the bore of the shaft 6, and its end, projecting beyond the end of shaft 6, engages with the correspondingly screwthreaded portion of head 10, drawing it in, or pushing it out, accord ing to the direction the hand wheel 12, fixed to the other end of screw 11, is turned. Co-l lar 7 is keyed to shaft 6, and upon its extension, or sleeve 7, the ratchet wheel 12 is fixed, between the branches of the pawllever 15, to which the pawl 13 is pivotally connected. For a more convenient operation of the pawl-lever a handle 21 is secured thereto.

The position of the tool in the tube, ready for the cutting operation, is indicated in broken lines in Fig. 1. By turning the hand wheel 12 to the right, the head 10 is drawn toward the collar 7, the cutter bars 8 are spread apart, and away from shaft 6, until the cutters 9 abut against the interior surface of the tube. After the cutters are thus set, the operator rotates the shaft 6-01? rather the whole toolloy moving handle 21 to and fro, in the same way as, for instance, the handle of a ratchet drill is operated, and with the other hand turns the hand wheel 12, intermittently, until the cutters have penetrated the entire thickness of the metal of the tube. The cutting is effected rapidly and neatly.

The modified construction of the tool, shown in Figs. 811 differs from that shown in Figs. 17 in that the cutter supports are designed in the form of toggle joints, the

blocks 28, wherein the cutters 9 are mounted, constituting their middle links, and the links 29, pivoted thereto, and to the collar 27 and head 30, constituting their lifting and lowering levers. Blocks 28, wherein the cutters 9" are mounted, are set in the bifurcated arms of a spider 31 (see Figs. 8, 9 and 10) and are guided and held thereby against lateral displacement under the stress, exerted thereon by the resistance of the metal against the cutting, the same as the cutters of the tool, shown in Figs. 1-7, are similarly guided and held against the resistance by the grooves 17 in the head 10. The feed screw 36 of the tool, shown in Figs. S-11, is provided with a right and left hand thread, and the perforations in the collar 27 and in the head 30 are correspondingly screw threaded, so that by turning the screw to the right, the collar 27 and the head 30 are moved together on shaft 26, whereby the cutter supports 28 are raised, as the cutting operation progresses.

For the turning of the hollow shaft 26', and the screw 36, set therein, the following mechanism is employed. The end of the shaft 26 is embraced by the hub of the bandle 21, a segmental portion of the shaft 26 is cut out, as shown at 38 in Fig. 11 and into this segmental recess the tongue 39 of the handle 21' is projected, abutting against the sides of the recess in the shaft and turning it when the handle 21 is moved. The notched disk 37 is secured on the screw 36, and the drop-bolt 21 mounted on the handle 21" in position to engage with one of the notches 4:1 in. the disk 37, carries the screw 36 with the shaft when the tool is operated. The recess 38 is provided to enable the screw 36 to be turned in either direction while the shaft 26, and the cutting parts of the tool, stand still. For this purpose the drop bolt 21 is raised from its engagement with the disk 37 and the handle 21 moved reversely until tongue 39 strikes against the end of recess 38 (orany lesser distance) whereupon the bolt 21 is again released to drop into engagement with one of the notches 41 of the disk 37, and the handle moved again forward. During this motion only the disk 37 and the screw 36 will be turned until the tongue 39 strikes again the other end of recess 38, whereupon the whole tool will be revolved. Thus the operator may rotate the tool, and, intermittently, by raising the bolt 21 and reversing the motion of the handle and then again dropping the bolt into engagement with the disk 37 turn the feed screw 36, whereby the collar 27 and head 30 are advanced tog-ether, and the cutters 9 are fed, or projected to the cutting. In all ther respects the modified construction of the tool is the same as the previously described.

My improved tube cutter is mostuseful for cutting out of flues and tubes when repairing water-tube boilers. It is used for this work as indicated in dotted lines in Fig. 1, the tool being inserted into the tube at the boiler head, the hand wheel 12 turned, whereby the cutter bars or supports 8 are spread fro-m the shaft 6, and the cutters 9 brought in contact with the tube. Then the handle is swung back and forth (or around) to rotate the shaft 6, whereby the cutters are propelled in a circle at right angle to the axis of the tube. By turning the hand wheel 12, about one quarter to one half of a turn, after each complete revolution of shaft 6 the cutters are advanced step to step, into the metal of the tube as the work progresses.

The removing of boiler tubes was heretofore a tedious and time-consuming operation, it being necessary to chisel out the eX- panded part and then work the tube out through the hole by turning and pulling it. By this tedious operation also the holes in the boiler head are often unduly enlarged, so much as to render it well night impossible, to make a tight joint by the usual method of expanding when the new tube is set in. By the use of my improved tube cutter the old tube is cut a few inches from the boiler head, on each end of the boiler, the middle tion, being thus made shorter than the boiler, and disconnected, drops to the bottom from where it is readily removed through the man hole, the end pieces are then driven outwardly by a smart blow or two of a hammer, and the tube hole in the boiler head is preserved in its original size and roundness. Thus also the work of inserting and tightly securingby expanding of new tubes, is greatly facilitated and a large part of the labor heretofore required is saved.

I claim as my invention:

1. A tube cutting tool, comprising a shaft, cutter supports, movably mounted thereon; cutters, set upon the supports; an interiorly screw-threaded head, slidably mounted on the shaft, and engaging with the cutter supports; a screw, engaging with the head, means for turning the screw and means for rotating the shaft; substantially as herein shown and described.

2. A tube cutting tool, comprising a shaft, a collar set thereon, cutter supports, pivoted to the collar; cutters mounted on the supports; an interiorly screw-threaded head, slidably mounted 011 the shaft, and engaging with the cutter supports; a screw, engaging with the head; means for turning the screw, and means for rotating the shaft; substantially as herein shown and described.

3. A tube cutting tool, comprising a hollow shaft, a collar set thereon, cutter supports, pivoted to the collar, and cutters mounted on the supports, a head engaging hollow shaft; a screw threaded bore in the head; a screw, journaled in the shaft and engaging with the screw threaded bore in the head; means for turning the screw, and 15 means for rotating the shaft; substantially as herein. shown and described.

JOHN STERNAD.

with the cutter supports; a screw threaded bore in the head; a screw, journaled in the shaft and engaging with the screw threaded bore in the head; means for turning the screw, and means for rotating the shaft; substantially as herein shown and described.

4:. A tube cutting tool, comprising a hollow shaft, a collar set thereon, cutter supports, pivoted to the collar; cutters mounted on the supports; a head, engaging with the cutter supports, slidably mounted on the Witnesses:

R. A. PIPER, AGNES F. MADDEN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents; Washington, D. C. 

